Wilhelm's Twin Brother von Seyffertitz

"Gustav first married at the tender age of 24 in Strasbourg to a theatrical actress named Katharina Hoffmann, suggesting that he had already toured throughout Europe with perhaps a succession of performing troupes by this time. Katharina gave birth to two sons, Wilhelm who was born in Copenhagen in 1882 became a professional juggler in Berlin and Adolar."

http://www.classichorror.free-online.co.uk/gustav.htm